Composite Solid Electrolyte With Lithiated Cellulose Ion Pathways
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Solution Overview
Problem
Current composite solid electrolytes for lithium-ion batteries face challenges with low room temperature ionic conductivity, mechanical performance, and lithium dendrite growth, limiting their safety and cycle life, especially due to agglomeration issues with inorganic ceramic particles.
Innovation Solution
A method is developed to prepare a composite solid electrolyte using lithiated cellulose as a soft filler, which enhances lithium ion conductivity and mechanical properties by dissolving cellulose in a solvent to expose oxygen-containing groups, promoting lithium ion migration and anchoring lithium salt anions, thereby improving electrochemical performance and inhibiting lithium dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic ceramic particles are added to improve room temperature ionic conductivity, then ionic conductivity is improved, but the particles agglomerate and lack stable lithium ion transport path, worsening mechanical performance and interface contact
Solution Approach 1:
The patent uses a composite structure combining polymer matrix with inorganic ceramic particles, where the polymer provides flexibility and interface contact while the ceramic particles provide ionic conductivity. This composite approach resolves the contradiction by integrating materials with complementary properties rather than using单一材料.
Solution Approach 2:
The patent introduces porous structures in the electrolyte composition, creating channels and pathways that facilitate lithium ion transport while maintaining mechanical integrity. The porous architecture prevents particle agglomeration by providing distributed transport paths throughout the material.
2Adaptability or versatility
If polymer electrolytes are used to achieve flexibility and high elastic state, then flexibility is improved, but room temperature ionic conductivity remains low, limiting large-scale application
Solution Approach 1:
The patent combines polymer electrolytes with inorganic ceramic particles to create a composite that maintains the flexibility and adaptability of the polymer while adding the high ionic conductivity of the ceramic phase. The synergistic combination allows both properties to coexist.
Solution Approach 2:
The patent modifies the chemical composition and structural parameters of the electrolyte by incorporating specific ceramic particles and adjusting the polymer-ceramic ratio. These parameter changes enable the material to achieve both flexibility and high ionic conductivity at room temperature.
3Use of energy by moving object
If inorganic solid electrolytes are used to achieve high room temperature conductivity, then ionic conductivity is improved, but interface contact performance is poor and flexibility is low
Solution Approach 1:
The patent creates a composite electrolyte where the polymer matrix provides softness and adaptability for good interface contact, while the dispersed inorganic ceramic particles provide high ionic conductivity. This composite structure allows the electrolyte to simultaneously achieve both properties.
Solution Approach 2:
The patent applies different material properties to different regions of the electrolyte: the polymer-rich regions provide flexibility and interface contact, while the ceramic particle-rich regions provide ionic conductivity pathways. This local differentiation resolves the contradiction between flexibility and conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite solid electrolyte exhibits high lithium ion conductivity, excellent electrochemical stability, and improved mechanical strength, significantly enhancing the safety and cycle stability of solid-state batteries, while preventing lithium dendrite growth and maintaining mechanical integrity.
Implementation Method 1
lithiated cellulose that can transmit lithium ions and limit the movement of lithium salt anions
Implementation Method 2
lithiated cellulose that can transmit lithium ions and limit the movement of lithium salt anions
Data Source
AI summary
A method for preparing a composite solid electrolyte with a soft filler is provided. The soft filler is obtained by converting nanocellulose particles into lithiated cellulose, and it is a transparent cement-like composite material, and has lithium ion transfer and anion molecular sieve functions. The composite solid electrolyte is obtained by mixing a solvent, a polymer, a lithium salt and a lithiated cellulose. The lithiated cellulose has numerous oxygen-containing groups, and opens up a new transmission path of lithium ions in the composite solid electrolyte. Meanwhile, the lithiated cellulose can limit disordered movement of lithium salt anions, so that the transportation efficiency of lithium ions is improved. Researches find that lithiated cellulose strengthens various physical and chemical properties of the composite solid electrolyte. The composite solid electrolyte prepared by the method has the advantages of simple process, easily available raw materials, safety, no pollution and suitability for large-scale production.